Microsoft has announced Windows 10 media briefing for January 21, 2015 9:00AM PT or 6:00PM CET. Next preview version of Windows 10 should be available soon after the event.
For more info about this event check Windows Blog or http://news.microsoft.com/windows10story/

This one liner PowerShell for reference, is intended to show how to find out all locked out accounts in Active Directory using Search-ADAccount with LockedOut parameter (ActiveDirectory module is required):Search-ADAccount -LockedOut
The output from this cmdlet will list all the locked out accounts. Furthermore, if you want to unlock all those accounts, the output of the Search-ADAccount can be piped to Unlock-ADAccount cmdlet (permission for unlocking ad accounts is required) for example:Search-ADAccount -LockedOut | Unlock-ADAccount
For more info about these powerful cmdlets please check TechNet: Search-ADAccount and Unlock-ADAccount .